Grinding-machine



G. W. LANT.

GRINDING MACHINE.

APPLICATION man 0:0.3, 191 1.

Patented Oct. 18, 1921.

2 SHEETS-SHEET I.

- fl/INVENTOW 5717 'w G. W. LANT.

. GRINDING MACHINE.

APPLICATION FILED 0503,1917.

1,394,418. Patented 001318, 1921.

2 SHEETSSHEET 2.

& if by UNITED STATES PATENT OFFICE. I

GEORGE W. LAN '1, OF PROVIDENCE, RHODE ISLAND, ASSEGETOR TO ABRASIVEMACHINE TOOL 00., OF EAST PROVIDENOE, RHODE ISLAND, A CORPORATION OFRHODE ISLAND.

Specification of Letters Patent.

GRINDING-MACHINE.

Patented Oct. 18, 1921.

Application filed December S, 1917. Serial No. 205,068.

To all whom it may concern:

Be it known that I, Gnonon W.v LANT, a citizen of the United States,residing at Providence, in the county of Providence, State of RhodeIsland, have invented certain new and useful Improvements in GrindingMachines, of which the following is a specification.

My invention relates to grinding-machines and particularly to that typeof machine in which the work and grinding-wheel are rotated continuouslyon opposite centers, with one of said elements reciprocated in relationto the other so that the wheel operates progressively along the work.The object or my invention is to provide an improved and simplifieddrivingnneans for either the workholdingor grindingwheel spindle whereinto permit of relative r ci nocation between these two elements andwhereby to allow for angular, axial adjustmentbetween the workand wheel.

The invention comprehends these and certain other improvements in thearrangement and method of operation of the driving-connections of themachine as fully set forth in the following specification, illustratedby the accompanying drawings, in which like reference charactersdesignate like parts. In the drawings Figure l is a front elevation ofthe coinplcte grinding-machine, showing its base or t 'ame partly insection to illustrate the driv ing-eonnections for the spindle carriedby the rcriprocable headstock;

Fig. 2, an end view of theheadstock showin; the reciprocating table onwhich it is mounted and the ways on which the latter slides; and

Fig. 3, an enlarged, vertical, sectional view of the headstock,illustrating the connections between the horizontal. drive-shatt and thespindle.

Referring first to Fig. 1, the machine in general comprises a standardor bed B; a horizontal table T reciprocable thereon; anangularlyauljustable tahle T" swiveled to the table T; a headstock Hcarried by the table T and provided with bearings :i'orthe work-spindleand a carriage or slide C having bearings for the grinding-spindle b.The carriage (I is mounted on a standard 7) projecting upwardly from theframe or bed B at on end thereof, and is arranged to slide laterally onsuitable ways or guides, not herein shown, to urovide for the feed ofthe grinding-wheel The gr1nding-spin- .dle S rotates in bearings in asleeve 8 held in a split bearing 0 at the side or" the slide or carriageC and the grinding-wheel G is attflillGCl thereto at the left-hand endthrough any convenient means whereby it may be readily removed and otherwheels of ditlerent sizes and shapes substituted in its place. At itsright-hand end the grindingspindle it carries a pulley P connected by abelt' to a larger pulley P rotatable at the end of a bearing C. Thepulley P is driven from the main drive-shaft D or" the machine through abelt or other connections passing up through the bed but as theseelements are not essential to the present improvements they are notherein shown or de- ,e ibed, It will he noted that the pulley P has arelatively wide face to provide tor the sliding of tle belt o therealongwhen the grinding-spindle S is adjusted longitudinally in the carriageC. This latter adjustment is accomplished by loosening the screws orbolts 0 in the split bearing 0 to allow the sleeve 8 to he slidtherethrough.

On the top of the bed 13 aretwo longitudinally extending ways lV, W, oneof which lV is formed with a f-groove or channel to as shown in Fig. 2.The ILClPlOCftlDlB table T is termed on its under side with runners V, Vwhich slide on the ways W W, one or" them V being of V-shape in crosssection to fit the groove in the way W. Referring to Fig. 1, thestandard 7) at the end of the bed B is cut away at its center to bridgethe table T to allow the latter to slide thereunder. Secured to thebottom of the table 1 is a rack-bar R formed with teeth adapted to meshwith a pinion O at the right-hand end of the machine, see Fig. l. Thepinion O is driven -from the main drive shaft D of the machine throughsuitableconnections, not herein shown and described, and rotated inalternately opposite directions by means o't' an automatically operatedclutch-device as usually provided, Through this arrangement the table Tis reciprocated hack and forth relatively to the grindingwheel G and theextent of its traverse is regulated by suitable adjusting-means as wellknown and generally used in machines'of this type.

Swiveled on the top of the table. T is the angularly-adjustable table Twhich carries the headstock H for the work-spindle S The spindle S isdriven from a horizontal. shaft K journaled in fixed bearings L, L onthe interior of the bed or frame B. At its. right-hand end the shaft Kis connected by a train of gearing to the main drive-shaft D, the usualprac ice being to employ change-gears or other speed-adjusting devicesto provide for regulating the speed of the work-spindle, but as suchmechanisms are familiar to those skilled in the art the arrangement isnot herein shown or described.

Referring now to the enlarged view, Fig. 3, the left hand bearing L forthe shaft K is preferably made adjustable both vertically andhorizontally to provide for its accurate alinenient with the oppositebearing L which is fixed to the bed B. 0n the overhanging, left-hand endof the bed B is a hub or bearing bored vertically to receive a bushing Mwhich is formed with a flange m adapted to abut the under side of thehub. The bushing hit is provided with a bore m arranged eccentric to itsaxis and adapted to receive a bolt or stud Z which is screwed up into ahub Z on the bearing L. The hub Z is threaded to receive a nut N whichabuts the top of the hub Z), and a washer N is interposed between thehead of the stud Z and the under side of the bushing M. By releasing thenut N and turning the stud Z the bearing L may be raised or lowered inrelation to the bushing M to regulate the vertical position of the endof the shaft K; and by turning the bushing M in its bore in the hub bthe bearing L may be adjusted laterally and longitudinally to a slightextent as required. After the bearing L has been properly alined withthe bearing L in this manner the nut is set up against the hub b to lockthe bearing in place. The end of the shaft K is reducedin diameter wherer it extends through the bearing L and a.

thrust-washer interposed between its shoulder and the end of thebearing. At its outer extremity the shaft K is reduced again andscrew-threaded to receive a nut n which binds a second washer 3" againstits shoulder abutting the other end of the bearing L.

As before indicated the shaft K drives the work-support or spindle Sthrough a train of gearing, one of the elements of which is slid'ablealong the shaft to provide for the traverse of the spindle in relationto the grinding-wheel. As shown in Figs. 1 and 3 the shaft K is formedwith longitudinal splines or keys 7c, 70, preferably four in 1'1L1Il1ber, extending ubstantially its whole length between the bearings L, L.Slidably mounted on the shaft K and keyed rotatively thereto by thesplines 7.0 is a bevel-gear 2 having its hub journaled in a bearing towhich depends. from the table T. The bearing u consists of a hub formedintegral with a vertical sleeve U which extends upwardly tlnough bores.t, t in the tables T and T. At its lower end the sleeve U is providedwith a flange n which abuts the face of a hub or boss 25 on the underside of the table T, and screws 3 reaching up therethrough and into theboss prevent the sleeve from turning in the. bores t. The hub or hearinga is supported 011 a curved arm l which forms an extension of the flangen and is bored at right-angles to the axis of the sleeve U. Fitted tothe bore of the hub a is a bushing 16 in which the turned down hub 5 ofthe gear 2 is journaled, a thrust-washer 6 being interposed between theshoulder on the gear and the end of the bushing, while a nut e isscrewed onto the outer end of the hub to hold the gear in place. The nute is. secured in place on the end of the hub 5 of the gear 2 by a key 7fitted to a slot in its bore and clamped against the threads on the hubby a set-screw 8.

The gear 2 meshes with a bevel-pinion 9 which is keyed to the shoulderedend of a vertical shaft 10 at 11 and held in place thereon by a nut 12.The shaft 10 is rotatable in the atrial bore 13 of the sleeve U, thecentral portion of the bore being chambered out to provide twospaced-apart bearings as shown. At its upper end the shaft 10 carries abevel-gear 1% formed integral therewith, or secured thereon ifpreferred, the bottom of the gear abutting the side of a thrust-washer'15 interposed between it and the end of the sleeve U.

The sleeve U, besides providing bearings for the gear 2 and verticalshaft 10, also serves as the axial pivot or center on which the table Tswivels to allow for its angular adjustment in a horizontal plane. Asshown more particularly in Fig. 1 the table T extends substantially thefull length of the table T and rests on raised spots or bosses 16, 17and 18, spaced at intervals to provide an extended bearing or support.At its left-hand end the main bearing for the table T consists of theannular, raised face 16 fitted to receive the ring-like hearing 19 ofthe table T on which the circular base It of the headstock H rests. Thesleeve U extends upwardly through the bores 27, t in the tables T, T,the bores being concentric with the bearing-rings 16 and 19,. and alsoreaches into a coaxial bore h in the base, of the headstock. H toprovide for the proper alinement of these parts. Referring to Fig. 2,the. headstock H is secured in. position on the table T by means ofbolts 20, having their heads. fitted to T slots 21. formed in the topof. the ring 19, with their ends projecting up through bosses 22. Nuts23 are screwed onto the ends of the bolts, 20 against the washers 24 toclamp the base A of the headstock against the ring 19; and by looseningthe nuts the headstock may be turned on its axis to adjust the positionof the workspindle S. The main adjustment for the spindle S, however, isprovided by the swiveling of the table T on the axis of the sleeve U. Asshown in Fig. 1 the table T is secured in place on the table T by meansof bolts 25 extending through arcuate slots 26, see Fig. 2, formed inextensions 27, 28 at either end of the table T, and screwed into thebosses 29, 18 on the top of the table T. For convenience in adjustingthe work-s )indle S in relation to the grinding-wheel (I a scale orindex X is mounted on the right-hand end of the table T and a pointer 00on the table T cooperates therewith to register and indi cate the degreeofangularity.

Surmounting the circular base it of the headstock H are two uprights orstandards 31, 32 formed at the top with cylindrical bearings 33, 3% forthe work-spindle S. Fitted to the bearings 33, 34 are tapered sleeves orbushings 35 and 36 held in place by nuts 37, 38 and 39, 4O screwed ontotheir ends to provide for tightening them in the bores of the bearings.At its right-hand end the spindle S is formed with a flange 41 whichabuts the end of the bushing 36, and secured to its outer extremity isa. sleeve or collar 42 to which the chuck or face-plate for carrying thework may be secured. This latter element is not herein shown ordescribed as it may be of any suitable construction as generallyemployed in the art. Abutting the inner end of the bushing 36 is acollar 44: screwed onto the threaded portion 45 of the spindle S. Thecollar 44 is adjusted against the end of the bushing 36 to take the endthrust of the spindle S in one direction, while the flange 41 takes theopposite thrust against the outer end of the bushing. To prevent thecollar 44; from turning on the spindle S after it has been adjusted inposition clamp 46 is employed to bind on the threads 45. The clamp 46 isfitted to a slot in the collar 44 in the manner of a key and is clampedagainst the threads by means of a set-screw 47. The central portion ofthe spindle S is reduced in diameter at as and fitted thereto is aclutch-member 50, held rotatively therewith by a key 51, but free toslide axially therealong. The clutchmember 50 is formed at one end withratchet-teeth 52 adapted to engage opposite teeth 54 on the hub of gearor sprocket 55. The sprocket 55 is free to rotate 011 the spindle S andis fitted with a bushing 56 in its bore to provide againstwear.

Below the spindle S is a smaller, parallel shaft 57 held fixedly in hubs58, 59 on the standards 31, 32. Rotatable on the shaft 57 is abevel-gear 60 having its hub formed as a sprocket 61 adapted to beconnected to the sprocket 55 by means of a link-belt or drive-chain 62.The gear 60 is fitted with a bushing 63 and is held from end move menton the shaft 57 by a sleeve 6%, abutting the end of its hub and the hub59. The teeth of the gear 60 mesh with those of the gear 14: on theupper end of-the vertical shaft 10.

Through the above described train of gearing the sprocket 55 is rotatedcontinuously from the horizontal shaft K, driven from the mainpower-shaft D of the machine, and by engaging the clutch-member 50 withthe sprocket 55 the spindle S may be rotated at the will of theoperator. To

provide for shifting the clutch '50 into and out of engagement with thesprocket 55 a handle or lever Y is pivoted at y to theside of theheadstock H, see Fig. 2, and carries a shoe 3 engaging an annular groove65 formed in the periphery of the clutch in ac cordance with awell-known arrangement of such devices. To restrain the clutch 50 fromunwarranted movement, after it has been shifted one way or the other, ayielding detent is provided comprising a springplunger 66 held in apocket 67 in the spindle S, see Fig. 3. The plunger 66 is formed with arounded end adapted to engage suit able recesses 68, 69 in the bore ofthe clutch 50 and is actuated by a coil-spring 70 held in the pocket 67to press against its end. A cover H is applied over the bearings 33, 34with its sides fitted to the standards 31, 32 to protect the gearingconnected to the spindle S The method of operation of the completemachine is as follows: The piece to be finished or ground is attached tothe faceplate or chuck carried at the end of the spindle S and asuitable size and shape of grindingwheel G is then applied to thespindle S in accordance with the character of work to be performed. F orstraight work the adjustable table T is set with the spindle S parallelwith the axis of the grindingwheel G, and in some cases in operating onrelatively heavy pieces an auxiliary support or steady-rest may beemployed, provision being made for attaching it to the top of the tableT. F or operating on tapered surfaces the table T is adjusted to bringthe work-spindle S at the required angle to the axis of thegrinding-spindle S, this being accomplished. by loosening the bolts 25and swinging it on its pivot U. During this adjustment the index X willbe slid pastthe pointer 02 to indicate the degree of angularity of thespindle and after the proper setting is secured the bolts 25 aretightened again. For work having a considerable degree of taper, wherethe range of adjustment of the table T is not sufficient to secure therequired angularity, then the headstock H is swung around on the sameaxis by loosening its bolts 20. Through this arrangement an extendedrange of angular adjustment capable. of meeting all requirements isprovided, rendering the machine universally adaptable to a wide varietyof work.

As before stated the whole machine is driven from the main drive-shaft Dwhich carries a pulley D adapted to be belted to any suitable source ofpower,- such as an electriom-otor, preferably supported on the floor.The shaft D is connected in any suitable manner to rotate the pulley P,and the latter drives the grinding-spindle S" through the belt 79, thegrinding-wheel G being rotated continuously thereby while fed againstthe work by hand or through the employment of suitable instrumentaliriesoperating on the slide or carriage C. The shaft D also drives the pinionO in alternately opposite directions through the means of the clutch andreversing-mechanism as usually provided, but not herein shown, and theslidingtable T is thereby reciprocated along the bed B to traverse thework-spindle back and forth relatively to the grindingwheel G.Meanwhile, the shaft K is driven continuously from the shaft D and itsgear 2 is rotated therewith to drive the shaft 10 through the gear 9.The gear 14 at the upper end of the shaft 10 drives the pinion 60 ontheshaft 57 and its sprocket 61 transmit rotation through the chain 62 tothe sprocket 55 on the spindle S. As before explained the sprocket 55normally rotates free on the spindle S, and to connect the latter to bedriven therefrom the clutch 50 is shifted into engagement with the teethon the sprocket by operating the hand-lever Y. In this manner thespindle S is connected to be driven at the will of the operator, and asthe table T is reciprocated back and forth along its ways thebevel-gear2 slides on the shaft K while being maintained in operative" connectionwith the gear 9 by its bearing a. The spindle S is thus-caused to bedriven to rotate the piece carried at its end while the work istraversed to and fro in relation to the grinding-wheel by thereciprocation of the table T.

It will be observed that my improvement provides a positive, directdrive from the main power-shaft of the machine to the work-support orspindle S, while permitting the longitudinal reciprocation of the workin relation to the grinding-wheel, and also al l'owingfor angularadjustment of the spindle relatively to the axis of the wheel. It isalsoto be noted that all of the' several. op erating elements of the machineare driven from a single, main drive-shaft, with the driving-connectionsentirely inclosed to protest them from dirt and dust and to prevent theliability of injury to the operator from exposed gearing. Furthermore,the main power-shaft D of the machine may be driven from a single primemover, such as an electric motor mounted. in convenient position on thefloor, without the use of overhead shafting and multiple belts.Heretofore it has usually been the practice to drive the separatespindles of the machine individually from overhead countershaftsrequiring numerous pulleys, relatively long belts, and a complexity ofapparatus which cut off the light and otherwise tended to hamper theadjustment and control of the work. With the present, improvedconstruction all of the work-performing parts are left clearly exposedand accessible to the operator while the driving-mechanism itself iscompacted and inclosed within the frame, thereby affording protectionagainst accident or injury while improving the appearance and increasingthe efficiency of the whole ma chine. In addition, my new arrangementprovides for more accurate and expeditious setting of the work in themachine, while allowing a wider range of adjustment thereof, thusrendering it more universally adaptable to different requirements andincreasing its efficiency and productiveness.

it is to be understood that I do not herein limit myself to the exactconstruction and arrangement of the parts of the invention as shown anddescribed. If preferred, for instance, the relation of the work-supportand grinding spindles might be reversed, the imp-reveddriving-connections being applied to the grii'iding-wheel while adaptingthis element for angular adjustment instead of the headstock. Variousother modifications might be made in the manner of applying theimprovements to the machine without departing from the spirit or scooeofthe in vention; therefore, withoutlimiting myself to the preciseembodiment herein disclosed, whatl claim is 1. In a grinding-machine,the combina tion with a reciprocating table, of means to reciprocatesaid table, a headstock swiveled on said table to: adapt it to beadjusted in angular relation to the table, a rotary-memher mounted onthe headstock, a longitudinal drive-shaft and a train of gearingconnecting the rotary-member to be driven from the drive-shaft in itsdifferent positions of angular adjustment in relation thereto whilebeing reciprocated with the table.

2. In a grinding-machine. the combination with a traveling table, ofmeans totravel the table, a rotary work-driver carried by the table andadjustable in angular relation to its path of travel, a drive-shaftjournaled in fixed relation with respect to the table, and a train ofgearing slidable with respect to the drive-shaft and connecting thework-- driver to be driven therefrom in its different positions ofangular adjustment in relation thereto.

8. In a grinding-machine, the combination with areciprocating table, ofmeans to reciprocate said table, a rotary work-driver journaled in abearing swiveled on the table, a drive-shaft journaled in hearings infixed relation with respect to the table, and gearing slidable withrespect to the drive-shaft and connecting said shaft to transmit motionto the work-driver during its reciprocation with the table when thework-driver is set in different positions of angular adjustment inrelation to the table.

4. In a grinding-machine, the combination with a reciprocating table, ofmeans to reciprocate said table, a headstock swiveled on said table, awork-driver mounted on the headstock to adapt it for angular adjustmentin relation to the table, a longitudinal drive-shaft, and gearingconnecting the drive-shaft to transmit motion to the work-driver in itsdifferent positions of angular adjustment in relation to the table, saidgearing and drive-shaft being slidable one with respect to the other toprovide for the reciprocation of the work-driver with the table. 7

5. In a grinding-machine, the combination with a grinding wheel of atraveling work-table, means to travel said work-table, a headstockswiveled on the table to adapt it to be adjusted laterally in angularrelation to the table, a rotary work-driver on the headstock, alongitudinal driveshaft mounted in fixed position in relation to thetable, and a train of gearing for transmitting motion from thedrive-shaft to the work-driver in all positions of angular adjustment ofthe headstock in relation to the table.

6. In a grinding-machine, the combination with a traveling work-table,of means to travel said table, a headstock swiveled on the table toadapt it for angular adjustment in relation to the path of movement ofthe table, a spindle journaled in hearings on the headstock, adrive-shaft journaled in bearings in fixed position in relation to thetable, and gearing connecting the spindle to be driven from thedrive-shaft during the travel of the table, said gearing providing fordriving the spindle in its different positions of angular adjustment inrelation to its path of movement.

7 In a grinding-machine, the combination with the frame thereof, of atable slidable thereon, means to reciprocatethe table, a headstockswiveled on the table to adapt it to be adjusted in angular relationthereto, a spindle journaled in bearings on the headstock, a horizontaldrive-shaft iournaled in hearings on the frame, and gearingconnectingsaid shaft with the spindle to drive the latter while adaptingit to be adjusted with the headstock and to be reciprocated with thetable.

8. In a grinding-machine, the combination with the frame thereof, of atable slidable thereon, means to reciprocate the table, a worlesupportrotatably mounted in a swiveled bearing on the table to adapt it to beangularly adjusted on a vertical axis, a vertical shaft extendingthrough bearings in the table and geared to the work-support, ahorizontal drive-shaft journaled in bearings on the frame, and a gearkeyed to said driveshaft and slidable therealong to drive the verticalshaft during its reciprocation with the table.

9. In a grinding-machine, the combination with the frame thereof, of atable slidable thereon, means to reciprocate the table, a spindlejournaled in a bearing swiveled on the table, a vertical shaft alsojournaled in hearings on. the table, gearing connecting said shaft todrive the spindle, a horizontal drive-shaft journaled in bearings on theframe, and a gear j ournaled in a bearing on the table to drive thevertical shaft while adapting it to slide longitudinally of thehorizontal drive-shaft to be rotatedtherefrom during the reciprocationof the table.

10. In a grinding-machine, the combination with the frame thereof, of atable reciprocably mounted on the frame, a headstock swiveled on thetable means to reciprocate the table, a work-support rotatably mountedon the headstock, a vertical shaft geared to the work-support to drivethe latter, a bevelgear at the lower end of said shaft, a horizontaldrive-shaft journaled in hearings on the frame, and a second bevel-gearkeyed to the drive-shaft and slidable therealong to adapt it to drivethe vertical shaft during the reciprocation of the latter with theheadstock.

11. In a grinding-machine, the combination with the frame thereof, of atable reciprocably mounted on the frame, means to reciprocate the table,a second angularly-adjustable table supported on the first table toreciprocate therewith, a work-support journaled in bearings on theadjustable table, a horizontal drive-shaft journaled in bearings on theframe, a vertical shaft journaled in abearing fastened to the firsttable to serve as a pivot for the second table, gearing connecting saidshaft with the worksupport, and gearing connecting the vertical shaftwith the drive-shaft to adapt it to be reciprocated therealong duringthe traverse of the tables.

12. In a grinding-machine, the combination with the frame thereof, of atable slidablv mounted thereon, means to reciprocate said table, asecond angularly-adjustable table swiveled on a vertical axis on thefirst table, a vertical shaft extending through a bearing common to bothtables with its axis coincident with the pivotal axis of the adjust-able table, a spindle journaled in bear.- ings on'the adjustabletable, gearing connecting said spindle with the vertical'shaft, ahorizontal drive-shaft journaled in bear.- ings on the main frame, andgearing con necting the vertical shaft with the driveshaft while beingslidable therealong to pro vide for the reciprocation of the tables.

13. In a grinding-machine, the combination with the frame thereof, of atable slid? ably mounted thereon, means to reciprocate said table, abearing extending vertically through said table, a second table swive edon said bearing to adapt it for angular adjustment on the axis thereof,a vertical shaft jonrnaled in said bearing, a work-support rotatablymounted on the adjustable table, gearing connecting said work-support tobe driven from the vertical shaft, a horizontal drive-shaft jonrnaled inbearings on the machine-frame, and gearing connecting the vertical shaftto be driven from the driveshaft while slidable therealong.

14. In grinding-machine, the combination with the frame thereof, of atable slidable thereon, means to reciprocate said table, a second tablemounted to swivel on a vertical axis on the first table, a headstockpivotally mounted on the second table to swivel on the same axistherewith, a spindle journaled in bearings on the headstock, a verticalshaft extending through both tables with its axis coincident with thepivotal axis of the headstock, gearing connecting said shaft to drivethe spindle, a horizontal drive-shaft journaled in hearings on themachine-frame beneath the table, and gearing slidable therealong andconnected to drive the vertical shaft.

15. In a gririding-Tmachine,- the combination with the frame thereof, ofa table slidable thereon, means to reciprocate said table, aheadstockswiveled on a vertical axis on the table, a spindle journaledin hearings on said headstock, a bearingrsleeve concentric with thevertical axis of the headstock, a shaft journaled in said sleeve,gearing connecting said shaft to drive the spindle, a gear at the lowerend of said shaft, a horizontal drive-shaft journaled in hearings on theframe, and agear journaled at the lower end of the bearing-sleeve tomeshwith the gear on the vertical shaft while adapting it to slide onthe drive-shaft during its rota tion therewith. Y

16. In a grinding-machine, the combination with the frame thereof, of atable slidable on ways on the frame, means to reciprocate said table, abearing-sleeve carried by the table in vertical position thereon, asecond table swiveled on said bearing-sleeve to adapt it for angularadjustment in relation to the first table, a splndle journaled inbearings on the adju stablestable, a vertical shaft journaled in thebearingrsleeve, gearing con necting said shaft to drive the spindle, agear on the lower end of the vertical shaft, a horizontaldrive-shaftjournaled in bearings on the frame, and a gear journaled onthe earing-sleeve to drive the vertical shaft,

said gear slidable on the drive-shaft to be otated therewith during thereciprocation of the table.

17. In a grinding-n:1.achine, the combination with the frame thereof, ofa horizontal drivershaft journaled in hearings on the terior of theframe, a table slidahlc on the frame above said shaft, a gear slidableon the drive-shaft while being rotated thereby, a bearing for said gearcarried by the table, a vertical shaft journaled in hearings on thetable, a gear connecting said shaf to be driven from the gear on thedrivefshaft, a headstock swiveled on the axis of the vertical shaft, avspindle jcnrnaled in bearings on the headstock, and getting connectingthe spindle to be driven from the vertical shaft.

18. In a grinding-machine, the combination with the. frame thereof, of apower-shaft journaled in hearings on the frame, a grinding-spindlejournniled in hearings on the top of the frame and connected. to bedriven from the power-shaft, a horizontal driveshaft journaledinbearings between the sides of the frame and also connected to bedriven from the power shaft, a table slidable on the frame, meansoperated from the p0wer-shaft to reciprocate the table, a train ofgearing carried by the table to be driven from the drivesha ft duringits traverse longitudinally thereof, and a rotatable work supportjournaled on the table and connected to be driven by the gearing carriedthereby.

19. In a grinding-machine, the combination with the frame thereof, of atable slidable thereon, means to-reciprocate said table,

second table angularly adjustable on the first table, a spindlejournaled in hearings on the second table to provide for its angularadjustment therewith, ahorizcntal drive shaft journaled in hearings onthe frame,

a train of gearing carried by the first table to be driven from thedrive-shaft whileslidable therealong, and manually-operable means'forconnecting the gearing to drive the spindle during the traverse of thelatter with the table.

20. In a grinding-machine, the combination with the frame thereof, of atable slidable thereon, a horizontal drive-shaft journaled in hearingson the frame beneath the table, gearcarried by the table to slide on thedrive-shaft, a vertical shaft carried by the table to be driven fromsaid gear, a headstock adjnstably mounted on the table, a cross-shaftjonrnaled in said headstock and connected to be driven from the verticalshaft, a spindle journaled in the headstock, sprockets on thecross-shaft and spindle, and

a drive-chain connecting said sprocket-s to drive the spindle.

21. In a grinding-machine, the combina tion with the frame thereof, ofa. horizontal drive-shaft journaled in hearings on the frame, a tableslidable on the frame above the drive-shaft, aheadstock adjustablmounted on said table, a spindle journaled in hearings on the headstock,a clutch rotatable with the spindle, a sprocket free to rotate on thespindle, a second sprocket, a chain connecting said sprockets, avertical shaft carried by the table, gearing connecting said verticalshaft to be driven from the drive-shaft, gearing connecting the verticalshaft to drive the sprockets, and manuallycontrolled means for operatingthe clutch. to connect the spindle to be driven from the sprockets.

22. In a grinding-machine, the combination with the frame thereof, of afixed hearing on said frame, a drive-shaft journaled at one end in saidbearing, a second adjustable bearing for the opposite end of the shaft,means to support said second hearing on the frame to adapt it to beadjusted vertically and horizontally with respect to the fixed bearing,a table slidable on the top of the frame, a spindle jo rnaled inbearings on the table, and a train of gearing carried by the table andconnecting the spindle to be driven from the drive-shaft.

23. In a grinding-machine, the combination With the frame thereof, of afixed shaftbearing thereon, a hub on the frame, a bushing in said hubhaving an eccentric bore, an adjustable shaft-bearing having a studseated in the bore of the bushing, means to secure said bushing in itshub While allowing for its axial adjustment to regulate the lateralposition of the bearing supported thereby, means to secure thebearing-stud in the bushing While providing for the vertical adjustmentof the bearing, a drive-shaftjournaled at opposite ends in the fixed andadjustable bearings, a table slidable on the frame, a spindle journaledin bearings on the table, and gearing connecting the spindle to bedriven from the drive-shaft.

In testimony whereof I my signature.

GEORGE W. LANT.

